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Page Title:
Detroit Diesel Allison 8V71T (Engine) |
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 NAVAIR 17-15-50.4
TM 38-301-4
T.O. 33-1-37-4
CGTO 33-1-37-4
COMPONENT:
Detroit Diesel Allison 8V71T (Engine)
LUBRICANT: MIL-L-2104
Fe
Ag
Al
Cr
Cu
Si
Sn
Ni
Pb
Mo
Mg
Normal Range
0-123
0-6
0-18
0-22
0-47
0-40
0-43
0-27
0-2
124-
Marginal Range
7
19-27
23-33
48-67
41-55
44-62
28-38
3-4
170
171-
High Range
8-10
28-36
34-44
68-88
56-75
63-81
39-49
5-6
215
Abnormal
216+
11+
37+
45+
89+
76+
82+
50+
7+
Abnormal Trend
(PPM Increase
43
3
7
9
17
15
16
10
2
in 10 hrs)
TECHNICAL INFORMATION
A faulty air induction system is normally a significant source of
silicon in engine oil. Antifoaming agents in engine oil normally
contain silicone which will give 3 to 7 PPM in new oil. Silicone is
used in "Print-O-Seal" cylinder head gaskets and crankshaft seals
for this engine which will normally show 20 to 30 PPM silicon in
the oil. Aluminum and cast iron parts in the engine can have
significant amounts (up to 10%) of silicon in their composition.
Significant wear can be expected on the piston skirts and cylinder
liners for this engine.
The engine is liquid-cooled; therefore, ethylene glycol present in
the engine oil would indicate a leak in the coolant system.
Oil control rings and first compression ring are chrome plated.
(Cr)
Tin
Plating on pistons.
(Sn)
Iron
Wear of cylinder walls. Wear of numerous other engine parts. Also
(Fe)
from machining chips left in engine.
Lead-Tin-Copper
Crankshaft bearings, both connecting rods, and mains. Wear of
(Pb-Sn-Cu)
many bushings, bearings, and thrust washers.
Copper-Lead-Tin-Zinc
Wear of many bushings.
(Cu-Pb-Sn-Zn)
Aluminum-Silicon-
Upper connecting rod bearing shell and No. 7 main bearing
Cadmium
washers.
(Al-Si-Cd)
APPLICABLE END ITEMS
175B, BRIDGE-MA, M107, M108, M109, M109A1, M109A2, M109A3, M110, M110A2, M578, M992, XM1050
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